Find All Solutions of the Following Equation in the Interval $\pi$

question 8

Multiple Choice

Find all solutions of the following equation in the interval [0, 2 $\pi$ ) . $2 \cos ^ { 3 } x = 2 \cos x$

• A) \(0 , \frac { \pi } { 2 } , 2 \pi , \frac { 3 \pi } { 4 }\)
• B) \(0 , \frac { \pi } { 2 } , 3 \pi , \frac { 3 \pi } { 2 }\)
• C) \(0 , \frac { \pi } { 3 } , \pi , \frac { 2 \pi } { 3 }\)
• D) \(0 , \frac { \pi } { 4 } , \pi , \frac { 2 \pi } { 3 }\)
• E) \(0 , \frac { \pi } { 2 } , \pi , \frac { 3 \pi } { 2 }\)

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